The function of the m-fn key is "auto focus area selection mode". You can use this function to obtain the correct flash exposure for a specific part of the subject; how to use it is: 1. Aim at the center of the viewfinder to cover the subject. Subject; 2. Press the camera's "M-Fn" button and take a photo.
#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.
What are the m-fn keys used for?
The "m-fn" key on Canon 5d3 is the autofocus area selection mode.
1. You can use this function to get the correct flash exposure for a specific part of the subject.
2. Aim at the subject covered in the center of the viewfinder, then press the camera's "M-Fn" button and take the photo.
Instructions for using each button:
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